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It’s no surprise then that rodenians mate in threes, with one male joining two females for life. Intercourse happens often, typically at least twice a day for the poor, overworked male, yet fertility rates are quite low. Females only ovulate every year or so, and their eggs have a thicker membrane than a terran’s. Scientists seem convinced that such a change was self-inflicted before UGC contact, a forward-thinking move to counter potential overpopulation.